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Heart Valves

Heart Valves

The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...

Overview of Pulmonary Circulation

Overview of Pulmonary Circulation

The pulmonary circulation is a vital system in our body that acts as a bridge between the respiratory and cardiovascular systems. It serves as a transport network for deoxygenated blood from the heart to the lungs and then returns oxygen-rich blood back to the heart.
The process begins with the right ventricle of the heart pumping deoxygenated blood into the pulmonary trunk. This large vessel extends about 5 centimeters before splitting into the left and right pulmonary arteries. These arteries...

Chambers of the Heart

Chambers of the Heart

The human heart is a complex organ made up of four chambers: the right and left atria and the right and left ventricles. These internal chambers are separated by partitions known as the interatrial and interventricular septa. The exterior of the heart features a groove known as the coronary sulcus that demarcates the atria from the ventricles, while the anterior and posterior interventricular sulci distinguish between the two ventricles.
Deoxygenated blood from the body is received in the right...

Overview of Systemic and Pulmonary Circulation

Overview of Systemic and Pulmonary Circulation

The systemic and pulmonary circuits are crucial components of the circulatory system, working together to transport blood between the heart, lungs, and the rest of the body. The process begins with pulmonary circulation, where deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and arteries. Upon reaching the lungs, the blood becomes oxygenated and returns to the heart, specifically to the left atrium, via the pulmonary veins.
The oxygenated blood is sent...

Gross Anatomy of the Lungs

Gross Anatomy of the Lungs

The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...

Anatomy of the Heart

Anatomy of the Heart

The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.

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Related Experiment Video

Updated: Jun 3, 2026

An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices

An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices

Published on: August 25, 2023

The pulmonary valve.

Kevin P Fitzgerald¹, Michael J Lim

¹Comprehensive Cardiology Consultants, Crestview Hills, KY, USA.

Cardiology Clinics

|April 5, 2011

Summary

This summary is machine-generated.

Pulmonary stenosis, a congenital narrowing of the pulmonary valve, is typically well-tolerated in mild to moderate cases. This review covers clinical evaluation and diagnostic methods for pulmonary stenosis and regurgitation.

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Area of Science:

Cardiology
Pediatric Cardiology
Cardiac Surgery

Background:

The pulmonary valve, comprising three leaflets akin to the aortic valve, is rarely impacted by acquired conditions, with congenital disorders being predominant.
Congenital heart defects frequently involve the pulmonary valve, with pulmonic stenosis being the most common hemodynamic abnormality.

Observation:

Pulmonic stenosis, characterized by a narrowed, domed pulmonary valve, is the most frequent hemodynamic issue affecting the pulmonary valve.
Mild and moderate forms of pulmonary stenosis are generally well-tolerated, indicating a favorable prognosis in many cases.

Findings:

This article provides a comprehensive overview of the clinical assessment strategies for pulmonary stenosis and pulmonary regurgitation.
Diagnostic modalities discussed include cardiac catheterization and echocardiography, crucial for evaluating the severity and hemodynamic impact of these conditions.

Implications:

Understanding the clinical presentation and diagnostic approaches is vital for managing patients with pulmonary stenosis and regurgitation.
Effective evaluation facilitates appropriate treatment strategies, potentially improving outcomes for individuals with these congenital pulmonary valve abnormalities.